diff --git a/src/multi_array_operation.h b/src/multi_array_operation.h
index 52fb76b..88a7b79 100644
--- a/src/multi_array_operation.h
+++ b/src/multi_array_operation.h
@@ -254,7 +254,7 @@ namespace MultiArrayTools
 	std::tuple<Ops...> mOps;
 
     public:
-	typedef decltype(PackNum<sizeof...(Ops)-1>::mkSteps(0, mOps)) ETuple;
+	typedef decltype(PackNum<sizeof...(Ops)-1>::template mkSteps<Ops...>(0, mOps)) ETuple;
 		
 	Operation(const Ops&... ops);
 	
@@ -469,7 +469,7 @@ namespace MultiArrayTools
     template <typename T, class... Ranges>
     MExt<void> ConstOperationRoot<T,Ranges...>::rootSteps(std::intptr_t iPtrNum) const
     {
-	return MExt<void>(0u); // !!!!!!
+	return MExt<void>(getStepSize( getRootIndices( mIndex->info() ), iPtrNum ));
     }
 
 
@@ -520,7 +520,7 @@ namespace MultiArrayTools
     template <typename T, class... Ranges>
     MExt<void> OperationRoot<T,Ranges...>::rootSteps(std::intptr_t iPtrNum) const
     {
-	return MExt<void>(0u); // !!!!!!
+	return MExt<void>(getStepSize( getRootIndices( mIndex->info() ), iPtrNum ));
     }
 
     template <typename T, class... Ranges>
diff --git a/src/pack_num.h b/src/pack_num.h
index 303537a..9bf257b 100644
--- a/src/pack_num.h
+++ b/src/pack_num.h
@@ -59,7 +59,7 @@ namespace MultiArrayHelper
 	}
 
 	template <class... Ops>
-	static auto mkSteps(std::intptr_t ii, const std::tuple<Ops const&...>& otp)
+	static auto mkSteps(std::intptr_t ii, const std::tuple<Ops...>& otp)
 	    -> decltype(together(PackNum<N-1>::mkSteps(ii, otp), std::get<N>(otp).rootSteps(ii)))
 	{
 	    return together(PackNum<N-1>::mkSteps(ii, otp), std::get<N>(otp).rootSteps(ii) );
@@ -130,7 +130,7 @@ namespace MultiArrayHelper
 	}
 
 	template <class... Ops>
-	static auto mkSteps(std::intptr_t ii, const std::tuple<Ops const&...>& otp)
+	static auto mkSteps(std::intptr_t ii, const std::tuple<Ops...>& otp)
 	    -> decltype(std::get<0>(otp).rootSteps(ii))
 	{
 	    return std::get<0>(otp).rootSteps(ii);
diff --git a/src/ranges/index_base.h b/src/ranges/index_base.h
index ab32ee3..99b6b0f 100644
--- a/src/ranges/index_base.h
+++ b/src/ranges/index_base.h
@@ -73,13 +73,15 @@ namespace MultiArrayTools
 
 	void print(size_t offset = 0) const { THIS().print(offset); }
 
+	IndexInfo info() const { return IndexInfo(THIS()); }
+	
 	// CHECK / IMPLEMENT !!!!!!
 	template <class Expr>
-	auto ifor(const Expr&& ex) const -> decltype(THIS().template ifor<Expr>(ex))
+	auto ifor(const Expr ex) const -> decltype(THIS().template ifor<Expr>(ex))
 	{ return THIS().template ifor<Expr>(ex); }
 
 	template <class Expr>
-	auto iforh(const Expr&& ex) const -> decltype(THIS().template iforh<Expr>(ex))
+	auto iforh(const Expr ex) const -> decltype(THIS().template iforh<Expr>(ex))
 	{ return THIS().template iforh<Expr>(ex); }
 
     private:
diff --git a/src/ranges/index_info.cc b/src/ranges/index_info.cc
index 824051f..e5372d9 100644
--- a/src/ranges/index_info.cc
+++ b/src/ranges/index_info.cc
@@ -70,5 +70,53 @@ namespace MultiArrayTools
     {
 	return mType;
     }
+
+
+    std::vector<IndexInfo> getRootIndices(const IndexInfo& info)
+    {
+	std::vector<IndexInfo> out;
+	out.reserve(info.dim());
+
+	if(info.type() == IndexType::SINGLE){
+	    out.push_back(info);
+	}
+	else {
+	    for(size_t i = 0; i != info.dim(); ++i){
+		auto vv = getRootIndices(*info.getPtr(i));
+		out.insert(out.end(), vv.begin(), vv.end());
+	    }
+	}
+	return out;
+    }
+
+    size_t getStepSize(const std::vector<IndexInfo>& iv, const IndexInfo& j)
+    {
+	size_t ss = 1;
+	auto ii = iv.end() - 1;
+	auto end = iv.begin();
+	while(*ii != j){
+	    ss *= ii->max();
+	    --ii;
+	    if(ii == end){
+		break;
+	    }
+	}
+	return ss;
+    }
+
+    size_t getStepSize(const std::vector<IndexInfo>& iv, std::intptr_t j)
+    {
+	size_t ss = 1;
+	auto ii = iv.end() - 1;
+	auto end = iv.begin();
+	while(ii->getPtrNum() != j){
+	    ss *= ii->max();
+	    --ii;
+	    if(ii == end){
+		break;
+	    }
+	}
+	return ss;
+    }
     
 } // end namespace MultiArrayTools
diff --git a/src/ranges/index_info.h b/src/ranges/index_info.h
index 93dc4ca..82f6743 100644
--- a/src/ranges/index_info.h
+++ b/src/ranges/index_info.h
@@ -20,8 +20,8 @@ namespace MultiArrayTools
 
 	IndexInfo(IndexInfo&& in) = default;
 	IndexInfo& operator=(IndexInfo&& in) = default;
-	//IndexInfo(const IndexInfo& in) = default;
-	//IndexInfo& operator=(const IndexInfo& in) = default;
+	IndexInfo(const IndexInfo& in) = default;
+	IndexInfo& operator=(const IndexInfo& in) = default;
 	
 	template <class IndexClass>
 	IndexInfo(const IndexClass& ind, size_t stepSize = 1);
@@ -76,7 +76,11 @@ namespace MultiArrayTools
 	return *this;
     }
 
-    
+    std::vector<IndexInfo> getRootIndices(const IndexInfo& info);
+
+    size_t getStepSize(const std::vector<IndexInfo>& iv, const IndexInfo& j);
+
+    size_t getStepSize(const std::vector<IndexInfo>& iv, std::intptr_t j);
 } // end namespace MultiArrayTools
 
 #endif